Patent GB-677325-A (GB)
Title: A lubricating composition
Filed: 1948-06-22
Abstract: A lubricating composition which is substantially non-corrosive comprises a major proportion of an aleaginous material and either (a) a polyvalent metal salt of an organic sulphonic acid together with an oxidation inhibitor, which is an arylamine and/or a phenol, in an amount less than one-sixth of the amount of the polyvalent metal salt of an organic sulphonic acid, or (b) a metal salt of a phenol formaldehyde condensation product, the metal salt in either case being present in a proportion greater than that which will give the composition an ash content of 0.8 per cent as determined according to the method of A.S.T.M. Designation ES-43a of 1945.  Oleaginous materials mentioned are mineral oils, polymerized olefins, copolymers of alkylene glycols and alkylene oxides, organic esters (e.g. di-2-ethylhexyl sebacate, dioctyl phthalate or trioctyl phosphate), polymeric tetrahydrofuran and polyalkyl silicone polymers (e.g. dimethyl silicone polymer). Mixtures of oils may be employed and a minor proportion of a fatty oil such as castor oil or lard oil may be mixed with a hydrocarbon oil or with a hydrocarbon oil-synthetic oil mixture.  Where the oleaginous material is an ester of an aliphatic dibasic acid of the type referred to in Specification 600,325, the use of mixture (a) is excluded.  The metal salts which may be employed include both the normal salts and the basic salts.  Mixtures of salts may be used.  Suitable metal salts include the lithium and sodium salts of phenol formaldehyde condensation products, and the calcium, barium, magnesium, strontium, aluminium, tin, lead, vanadium, bismuth, chromium, molybdenum, manganese, iron, cobalt and nickel salts of both organic sulphonic acids and phenol formaldehyde condensation products.  Examples of organic sulphonic acids, from which the polyvalent metal salts may be derived, are petroleum sulphonic acid, triisopropyl naphthalene sulphonic acid, diaryl naphthalene sulphonic acid, diwax benzene sulphonic acid, diwax naphthalene sulphonic acid, benzene disulphonic acid and lauryl sulphonic acid.  Suitable phenol formaldehyde condensation products, the metal salts of which may be used, are octylphenol formaldehyde condensation products. Specific examples of suitable oxidation inhibitors of the arylamine type are phenyl-a- and b -naphthylamine. Preferred oxidation inhibitors of the phenol type are alkyl-substituted hydroxy aromatic compounds such as 2, 6-dimethylphenol, 2, 4-dimethyl-6-tert.-butylphenol, 2, 4-dimethyl-6-tert.-octylphenol and 2, 6-di-tert.-butyl-4-methylphenol.  The lubricating composition may contain other oxidation or corrosion inhibitors, particularly organic carboxylic acids (e.g. gallic, tannic and octyl succinic acids), partial esters of polyhydric alcohols (e.g. glyceryl mono-oleate), sulphur compounds (e.g. sulphurized oleic acid and sulphurized sperm oil), phosphorus-containing compounds (e.g. triphenyl phosphite, tricresyl phosphate and lecithin), compounds containing both sulphur and nitrogen (e.g. dianiline disulphide), compounds containing both sulphur and phosphorus (e.g. the reaction products of phosphorus sulphide and a phenol or a poly-olefin), and halogen-containing organic compounds.  In the examples, mineral lubricating oil compositions are described containing (1) normal or basic calcium petroleum sulphonate and phenyl-a-naphthylamine, (2) basic calcium petroleum sulphonate, phenyl-a-naphthylamine and 2, 6-di-tert.-butyl-4-methyl phenol and (3) calcium salt of an alkyl phenol formaldehyde condensation product.  The Specification as open to inspection under Sect. 91 refers to a lubricating composition comprising a major proportion of an oleaginous material and a metallic salt of an acidic organic compound in a proportion that is greater than the amount at which the maximum corrosion and wear is caused by the presence of the salt.  A list of suitable metallic salts and also a list of additional substances which may be present in the lubricating composition is given.  In further examples, mineral lubricatin oil compositions are described which contain the calcium or barium salt of an alkyl phenol sulphide.  This subject-matter does not appear in the Specification as accepted.